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Don't you see how gambling is tempting, like you can use $2 to have different possibilities with potential win of $1m depending on the casino max cashout but winning that potential money is the problem because casino isn't foolish enough to make you a millionaire in just one day. You have seen how gullible people put money on ponzi schemes even despite the warnings? It's not like they don't know, they do but they are just stupid because of greed, that's how gamblers think sometimes.
$2 won't make you a millionaire in a day, or even a month, or a year if you're just trying your luck at gambling. $2 can become $10 or even $100 if you're really lucky - but it doesn't make sense to turn it into $1 million, even if you're talking about the potential for a big win.
Many gamblers have spent more than they've won - they admit they lost, but they don't stop because their gambling goals are different. Someone who always wants to make money from gambling tends to have less logical decisions and mindsets - even if they win, I don't think they'll be able to beat the casino and become a millionaire.